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A novel low-loss Ba 12 InNb 9 O 36 microwave dielectric ceramic with 18-layer hexagonal perovskite structure

Journal of the European Ceramic Society, ISSN: 0955-2219, Vol: 41, Issue: 14, Page: 7044-7049
2021
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Article Description

A novel Ba 12 InNb 9 O 36 microwave dielectric ceramic is prepared by a solid-state reaction method. Rietveld refinement and transmission electron microscopy confirm that Ba 12 InNb 9 O 36 crystallizes as an 18-layer hexagonal perovskite structure with a stacking sequence (cccchh) 3 for the BaO 3 layers. A dense and compact microstructure is observed for the Ba 12 InNb 9 O 36 ceramic, when sintered at 1470 °C, with an optimal relative density of 96.84 %. The intrinsic dielectric constant and dielectric loss are investigated based on the infrared reflectivity spectrum. The microwave dielectric properties of ε r = 36.12, Q × f = 57,250 GHz (at f = 6.24 GHz), and τ f = 17.58 ppm/°C are obtained, rendering Ba 12 InNb 9 O 36 ceramic a promising candidate material for microwave electronic devices.

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